Accessibility with color scheme

[hannakim91]

Lighthouse and Axe dev tools both show there are issues with the following scenarios:

• The white text on red background
  
• Light grey text on white bg
  
• White text on navy bg
  

Resources:

• Some discussion here: Author believes contrast with white text on high contrast background works well but several commenters say it might not actually be the case for those with certain vision issues.
• Further info here on how it affects astigmatism